Method for dynamically estimating maximum available capacity of decommissioned power battery
A power battery and battery capacity technology, applied in the direction of measuring electric variables, calculating, measuring electricity, etc., can solve the problem of difficult estimation of battery capacity, achieve the effect of improving speed and accuracy, improving efficiency, and increasing the amount of effective information
Pending Publication Date: 2021-08-13
NANJING INST OF TECH
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Estimating battery capacity during charging while the battery is not fully disch
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[0038] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0039] A method for dynamically estimating the maximum available capacity of a decommissioned power battery according to the present invention, the flow chart is as follows figure 1 shown, including the following steps:
[0040] Step S1: Extract the feature quantity related to the battery capacity decay through the charging curve, and use the heterogeneous point algorithm to clean the abnormal data points in the feature quantity, so as to increase the effective information contained in the feature quantity.
[0041] Specifically, in order to establish a reliable data-driven capacity estimation model, conduct characteristic tests and aging cycle tests on decommissioned power batteries, figure 2 The current and voltage response curves of the battery under the ambient temperature of 25°C and the corresponding charging current f...
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The invention discloses a method for dynamically estimating the maximum available capacity of a decommissioned power battery, which comprises the following steps: firstly, extracting a characteristic quantity related to battery capacity attenuation through a charging curve, and cleaning abnormal data points in the characteristic quantity by adopting a heterogeneous point algorithm to improve the effective information quantity contained in the characteristic quantity; and then establishing a capacity estimation model based on a relevance vector machine algorithm, introducing an improved hummingbird algorithm to optimize model parameters, and finally estimating the capacity of the retired power battery based on the obtained characteristic quantity and the improved capacity estimation model. According to the method, the heterogeneous point algorithm, the relevance vector machine algorithm and the improved hummingbird algorithm are combined, so that the rapidity and accuracy of capacity estimation of the retired power battery are effectively improved.
Description
technical field [0001] The invention relates to a method for calculating the capacity of a power battery, in particular to a method for dynamically estimating the maximum available capacity of a decommissioned power battery. Background technique [0002] As the "heart" of new energy vehicles, the demand for power batteries is increasing year by year. The service life of new energy vehicle power batteries is generally about 3-5 years. When the battery capacity is less than 80%, it will be eliminated from the vehicle. According to this calculation, the first retirement peak of new energy vehicle power batteries has arrived. The disposal of large-scale batteries not only wastes the use value of batteries, but also poses a major threat to the ecological environment, while decommissioned batteries still have high energy value in other places, and their cascade utilization has both environmental protection and economic value. The overall application is an important means to maxi...
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Login to View More IPC IPC(8): G06F30/27G06N3/00G01R31/367G01R31/392G06F111/06G06F111/08G06F119/04G06F119/08
CPCG06F30/27G06N3/006G01R31/367G01R31/392G06F2111/08G06F2111/06G06F2119/08G06F2119/04
Inventor 苏令孟高军孙玉坤刘海涛李建林饶宇飞赵宇夏涛李萌露余昊晨
Owner NANJING INST OF TECH